Galvanic Replacement Reactions in Metal Oxide Nanocrystals

Galvanic replacement reactions provide a simple and versatile route for producing hollow nanostructures with controllable pore structures and compositions. However, these reactions have previously been limited to the chemical transformation of metallic nanostructures. We demonstrated galvanic replac...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2013-05, Vol.340 (6135), p.964-968
Main Authors: Oh, Myoung Hwan, Yu, Taekyung, Yu, Seung-Ho, Lim, Byungkwon, Ko, Kyung-Tae, Willinger, Marc-Georg, Seo, Dong-Hwa, Kim, Byung Hyo, Cho, Min Gee, Park, Jae-Hoon, Kang, Kisuk, Sung, Yung-Eun, Pinna, Nicola, Hyeon, Taeghwan
Format: Article
Language:English
Subjects:
Anodes
Chemical composition
Chemical reactions
CMOS
Cobalt - chemistry
Cross-disciplinary physics: materials science
rheology
Dissolution
Exact sciences and technology
Exteriors
Ferric Compounds - chemistry
Ions
Lithium
Lithium batteries
Manganese Compounds - chemistry
Materials science
Metal Nanoparticles - chemistry
Metal Nanoparticles - ultrastructure
Metal oxides
Methods of nanofabrication
Microscopy, Electron, Transmission
Nanocrystalline materials
Nanocrystals
Nanoparticles
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Nanostructures
Oxides
Oxides - chemistry
Perchlorates
Perchlorates - chemistry
Physics
Placing
Replacement reactions
Research universities
Tin Compounds - chemistry
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Summary:Galvanic replacement reactions provide a simple and versatile route for producing hollow nanostructures with controllable pore structures and compositions. However, these reactions have previously been limited to the chemical transformation of metallic nanostructures. We demonstrated galvanic replacement reactions in metal oxide nanocrystals as well. When manganese oxide (Mn₃O₄) nanocrystals were reacted with iron(ll) perchlorate, hollow box-shaped nanocrystals of Mn₃O₄/γ-Fw₂O₃ ("nanoboxes") were produced. These nanoboxes ultimately transformed into hollow cagelike nanocrystals of γ-Fe₂O₃ ("nanocages"). Because of their nonequilibrium compositions and hollow structures, these nanoboxes and nanocages exhibited good performance as anode materials for lithium ion batteries. The generality of this approach was demonstrated with other metal pairs, including Co₃O₄/SnO₂ and Mn₃O₄/SnO₂.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1234751